Cohort Study

• Observational/Analytical study
• Obtain evidence to support or refute existence of association between a cause and disease
• Usually Prospective study/ Longitudinal study/ “Forward looking study”
• Follow up at different time points, while actively looking for the outcome
• Cause to effect
• Eg.: Role of exposure to dyes in development of Bladder cancer

Points

• Cohorts identified before disease appearance
• Study groups observed over specified period of time, to determine disease incidence

Framework of a cohort study:

Incidence of disease among exposed = a/ a + b Incidence of disease among non-exposed =c/ c + d

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